How do you iterate over a DataFrame?

To iterate over a DataFrame in Python, we can use various methods depending on our specific needs. We can use the iterrows() method to iterate over each row in the DataFrame. In this method, each horizontal subset is in the form of (row-index, series), where the series contains all column values for that row-index. Additionally, we can use the iteritems() method to iterate over each column in the DataFrame. Here, each vertical subset is in the form of (column-index, series), where the series contains all row values for that column-index.